On 1/16/07, Richard Prosser wrote: > You might want to factor in any live bodies in the room also - > esprcially if someone'd going to be there for an extended period. To extend upon: IIRC, when calculating heating/cooling needs for a large-ish building, the initial estimate is 100 watts per human, to be subtracted from heating needs or added to cooling needs. That seems high to me, though, but I'm no expert. > > > > I suggested simply measure the current and voltage applied to the room > > > > to determine power consumed (and average over some time) and this will > > > > be the heat/energy that needs to be removed. (Unless there are cables > > > > that transfer the power out of the room) As said elsewhere, remember your power factor. You might do better (easier at any rate) looking at the power consumption needs of each item and adding them up (i.e., this PC has a 400W power supply, that monitor has a 65W, etc.) although this will end up with you estimating long since it is unlikely that you will ever be running everything anywhere near maximum. > > > > My collegues indicated that not all the power consumed by the > > > > processors and other hardware is converted into heat. The energy is > > > > converted into work done by the processor. That's just ridiculous. Do a dimensional analysis. If they can find an equation associating energy in joules to computational cycles WITHOUT INVOLVING current and voltage, well, we have a problem. Mike H. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist